Why won't my music sync up on WP8.1?

For one reason or another, my music isn't syncing up on my Windows 8.1 phone. On my PC and Surface tablet my music is syncing just fine. I used to go into the music app on my phone and the top would show "loading" and then my music would be synced up, but now there's no loading and non of my collection is syncing up...

Reboot phone
Go to settings
Storage sense
Check on the storage bar
Wait till the process of calculating space completes
Click on music and select manage

It should now open the Xbox music app and all your songs would show up

I'm not having a problem with it showing music that's physically stored on my phone. I'm having a problem with my phone reaching out to the cloud, recognizing what's in my collection, and adding it to my collection on my phone.